Fundamental types

struct api	c type
bool	bool
char	signed char
uchar	unsigned char
short	short
ushort	unsigned short
int	int
uint	unsigned int
long	long
ulong	unsigned long
longlong	long long
ulonglong	unsigned long long
float	float
double	double
ssize_t	ssize_t
size_t	size_t
int8_t	int8_t
uint8_t	uint8_t
int16_t	int16_t
uint16_t	uint16_t
int32_t	int32_t
uint32_t	uint32_t
int64_t	int64_t
uint64_t	uint64_t
struct	struct
union	union

Inheritance diagram

built-in methods

• get $buffer ()

  Return a node buffer

• get $arrayBuffer ()

  Return an ArrayBuffer

• get $address ()

  Return real address of current object

• get $value ()

  Get value

• set $value (value)

  Set value

Static methods

• get byteSize ()

  Similar with sizeof()

• times (length)

  Return an instance of BaseArrayType

Example

int

const struct = require('node-c-struct')

const a = new struct.int()

a.$value = 100

console.log(a) // <Buffer 64 00 00 00>
console.log(a.$value) // 100

array

const struct = require('node-c-struct')

const arr = new (struct.int.times(3))()

for (let i = 0; i < arr.length; i++) {
  arr[i].$value = i + 1
}

console.log(arr) // <Buffer 01 00 00 00 02 00 00 00 03 00 00 00>
console.log(arr[1].$value) // 2

union

const struct = require('node-c-struct')

class MyUnion extends struct.union {
  static get fields () {
    return [
      [ 'x', struct.char ],
      [ 'y', struct.int ]
    ]
  }
}

const a = new MyUnion()

a.$value = {
  'x': 266
}

console.log(a) // <Buffer 0a 00 00 00>
console.log(a.x.$value) // 10
console.log(a.y.$value) // 10

a.$value = {
  'y': 267
}

console.log(a) // <Buffer 0b 01 00 00>
console.log(a.x.$value) // 11
console.log(a.y.$value) // 267

struct

const struct = require('node-c-struct')

class Point extends struct.struct {
  static get fields () {
    return [
      [ 'x', struct.int ],
      [ 'y', struct.int ]
    ]
  }
}

const point = new Point({
  x: 1,
  y: 10
})

point.y.$value = 2

console.log(point) // <Buffer 01 00 00 00 02 00 00 00>

complex struct

const struct = require('node-c-struct')

class Point extends struct.struct {
  static get fields () {
    return [
      [ 'x', struct.int ],
      [ 'y', struct.int ]
    ]
  }
}

class MyStruct extends struct.struct {
  static get fields () {
    return [
      [ 'a', struct.char ],
      [ 's', Point ],
      [ 'b', struct.char.times(3) ]
    ]
  }
}

const s = new MyStruct()

s.a.$value = 1
s.s.x.$value = 2
s.s.y.$value = 3
s.b[0].$value = 4
s.b[1].$value = 5
s.b[2].$value = 6

console.log(s) // <Buffer 01 00 00 00 02 00 00 00 03 00 00 00 04 05 06 00>